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The Datafile PD-CD 1 Issue 2
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PDCD-1 - Issue 02.iso
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_utilities
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utilities
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003
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!GS
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c
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GXCLIST
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1991-10-26
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/* Copyright (C) 1991 Aladdin Enterprises. All rights reserved.
Distributed by Free Software Foundation, Inc.
This file is part of Ghostscript.
Ghostscript is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
to anyone for the consequences of using it or for whether it serves any
particular purpose or works at all, unless he says so in writing. Refer
to the Ghostscript General Public License for full details.
Everyone is granted permission to copy, modify and redistribute
Ghostscript, but only under the conditions described in the Ghostscript
General Public License. A copy of this license is supposed to have been
given to you along with Ghostscript so you can know your rights and
responsibilities. It should be in a file named COPYING. Among other
things, the copyright notice and this notice must be preserved on all
copies. */
/* gxclist.c */
/* Command list 'device' for Ghostscript. */
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gxbitmap.h"
#include "gsmatrix.h" /* for gxdevice.h */
#include "gxdevice.h"
#include "gxdevmem.h" /* must precede gxclist.h */
#include "gxclist.h"
/* Patch a couple of things possibly missing from stdio.h. */
#ifndef SEEK_SET
# define SEEK_SET 0
#endif
#ifndef SEEK_CUR
# define SEEK_CUR 1
#endif
/*
* The implementation here is somewhat lazy in that it requires the entire
* bitmap argument to copy_mono/color (in fact, all the scan lines involved)
* to fit into the tile_data buffer at once.
*/
#define cdev ((gx_device_clist *)dev)
/* Forward declarations of procedures */
private dev_proc_open_device(clist_open);
private dev_proc_get_initial_matrix(clist_get_initial_matrix);
private dev_proc_map_rgb_color(clist_map_rgb_color);
private dev_proc_map_color_rgb(clist_map_color_rgb);
private dev_proc_fill_rectangle(clist_fill_rectangle);
private dev_proc_tile_rectangle(clist_tile_rectangle);
private dev_proc_copy_mono(clist_copy_mono);
private dev_proc_copy_color(clist_copy_color);
/* The device descriptor */
private gx_device_procs clist_procs =
{ clist_open,
clist_get_initial_matrix,
gx_default_sync_output,
gx_default_output_page,
gx_default_close_device,
clist_map_rgb_color,
clist_map_color_rgb,
clist_fill_rectangle,
clist_tile_rectangle,
clist_copy_mono,
clist_copy_color,
gx_default_draw_line,
gx_default_fill_trapezoid,
gx_default_tile_trapezoid
};
gx_device_clist gs_clist_device =
{ sizeof(gx_device_clist),
&clist_procs,
"command list",
0, 0, 1, 1, no_margins, 0, 0, 0, 0, /* generic */
NULL, NULL, 0
};
/* ------ Define the command set and syntax ------ */
/* A command always consists of an operation followed by operands. */
/* The operands are implicit in the procedural code. */
typedef enum {
cmd_op_set_color0 = 0, /* color+2 in op byte, [color] */
cmd_op_set_color1 = 0x10, /* color+2 in op byte, [color] */
cmd_op_set_tile = 0x20, /* raster, width, height, <bits> */
cmd_op_set_phase = 0x30, /* x, y */
cmd_op_fill_rect = 0x40, /* rect */
cmd_op_fill_rect_short = 0x50, /* dh|0 in op byte, rect_short,[dh] */
cmd_op_fill_rect_tiny = 0x60, /* dw in op byte, rect_tiny */
cmd_op_tile_rect = 0x70, /* rect */
cmd_op_tile_rect_short = 0x80, /* dh|0 in op byte, rect_short,[dh] */
cmd_op_tile_rect_tiny = 0x90, /* dw in op byte, rect_tiny */
cmd_op_copy_mono = 0xa0, /* rect, data_x, raster */
cmd_op_copy_color = 0xb0, /* rect, data_x, raster */
cmd_op_end_run = 0xc0, /* (nothing) */
cmd_op_end
} gx_cmd_op;
#ifdef DEBUG
private char *cmd_op_names[16] = {
"set_color_0", "set_color_1", "set_tile", "set_phase",
"fill_rect", "fill_rect_short", "fill_rect_tiny", "tile_rect",
"tile_rect_short", "tile_rect_tiny", "copy_mono", "copy_color",
"end_run", "?d0?", "?e0?", "?f0?"
};
private ulong cmd_op_counts[256];
private ulong cmd_tile_count, cmd_copy_count;
private int
count_op(int op)
{ ++cmd_op_counts[op];
#ifdef DEBUG
if ( gs_debug['L'] )
dprintf2(", %s %d\n", cmd_op_names[op >> 4], op & 0xf);
#endif
return op;
}
#else
# define count_op(store_op) store_op
#endif
typedef struct {
short x, y, width, height;
} gx_cmd_rect;
typedef struct {
byte dx, dy, dwidth, dheight; /* dheight is optional */
} gx_cmd_rect_short;
#define cmd_min_short (-128)
#define cmd_max_short 127
typedef struct {
unsigned dx : 4;
unsigned dy : 4;
} gx_cmd_rect_tiny;
#define cmd_min_tiny (-8)
#define cmd_max_tiny 7
/* Define the size of the largest command, */
/* not counting any bitmap. */
#define cmd_largest_size (1 + sizeof(gx_cmd_rect) + 4)
/* Define the prefix on each command in the buffer for writing. */
typedef struct cmd_prefix_s cmd_prefix;
struct cmd_prefix_s {
cmd_prefix *next;
uint size;
};
/* Remember the current state of one band when writing or reading. */
struct gx_clist_state_s {
gx_color_index color0, color1; /* most recent colors */
gx_bitmap tile; /* most recent tile */
gs_int_point phase; /* most recent tile phase */
gx_cmd_rect rect; /* most recent rectangle */
/* Following are only used when writing */
uint size; /* total size of buffered commands */
/* for this band */
uint band; /* band number */
cmd_prefix *head, *tail; /* list of commands for band */
};
/* The initial values for a band state */
private gx_clist_state cls_initial =
{ gx_no_color_index, gx_no_color_index,
{ 0, 0, 0, 0 }, { 0, 0 }, { 0, 0, 0, 0 },
1, 0, 0, 0
};
/* Initialize the device state */
private int
clist_open(gx_device *dev)
{ /*
* The buffer area (data, data_size) holds a tile cache when
* both writing and reading. The rest of the space is used for
* the command buffer and band state bookkeeping when writing,
* and for the rendering buffer (image device) when reading.
* For the moment, we divide the space up arbitrarily.
*/
byte *data = cdev->data;
uint size = cdev->data_size;
#define alloc_data(n) data += (n), size -= (n)
gx_device *target = cdev->target;
int raster, nbands, band;
gx_clist_state *states;
uint state_size;
cdev->ymin = cdev->ymax = -1; /* render_init not done yet */
cdev->tile_data = data;
cdev->tile_size = (size / 5) & -4; /* arbitrary! */
alloc_data(cdev->tile_size);
raster = (((target->width * target->bits_per_color_pixel + 31) >> 5) << 2) + sizeof(byte *);
cdev->band_height = size / (uint)raster;
cdev->nbands = nbands = target->height / cdev->band_height + 1;
#ifdef DEBUG
if ( gs_debug['l'] | gs_debug['L'] )
dprintf4("[l]width=%d, raster=%d, band_height=%d, nbands=%d\n",
target->width, raster, cdev->band_height, cdev->nbands);
#endif
state_size = nbands * sizeof(gx_clist_state);
if ( state_size > size / 2 )
return -1; /* not enough room */
cdev->mdev.base = data;
cdev->states = states = (gx_clist_state *)data;
alloc_data(state_size);
cdev->cbuf = data;
cdev->cnext = data;
cdev->cend = data + size;
cdev->ccls = 0;
for ( band = 0; band < nbands; band++, states++ )
*states = cls_initial, states->band = band;
#undef alloc_data
return 0;
}
/* Forward the non-displaying operations to the target device. */
private void
clist_get_initial_matrix(gx_device *dev, gs_matrix *pmat)
{ (*cdev->target->procs->get_initial_matrix)(dev, pmat);
}
private gx_color_index
clist_map_rgb_color(gx_device *dev, ushort red, ushort green, ushort blue)
{ return (*cdev->target->procs->map_rgb_color)(dev, red, green, blue);
}
private int
clist_map_color_rgb(gx_device *dev, gx_color_index color, ushort rgb[3])
{ return (*cdev->target->procs->map_color_rgb)(dev, color, rgb);
}
/* Print a bitmap for tracing */
#ifdef DEBUG
private void
cmd_print_bits(byte *data, int height, int raster)
{ int i, j;
for ( i = 0; i < height; i++ )
{ byte *row = data + i * raster;
dprintf("[L]");
for ( j = 0; j < raster; j++ )
dprintf1(" %02x", row[j]);
dputc('\n');
}
}
#else
# define cmd_print_bits(data, height, raster)
#endif
/* ------ Writing ------ */
/* Utilities */
#define cmd_set_rect(rect)\
((rect).x = x, (rect).y = y,\
(rect).width = width, (rect).height = height)
private void
clist_write(FILE *f, byte *str, uint len)
{ fwrite(str, 1, len, f);
}
/* Write out the buffered commands, and reset the buffer. */
private void
cmd_write_buffer(gx_device *dev)
{ FILE *file = cdev->file;
int nbands = cdev->nbands;
gx_clist_state *pcls;
uint size = 0;
int band;
for ( band = 0, pcls = cdev->states; band < nbands; band++, pcls++ )
size += pcls->size;
#ifdef DEBUG
if ( gs_debug['l'] | gs_debug['L'] )
dprintf1("[l]write_buffer %d\n", size);
#endif
if ( size == 0 ) return; /* nothing to write */
clist_write(file, (byte *)&size, sizeof(size));
size = 0;
for ( band = 0, pcls = cdev->states; band < nbands; band++, pcls++ )
{ clist_write(file, (byte *)&size, sizeof(size));
size += pcls->size;
}
clist_write(file, (byte *)&size, sizeof(size));
for ( band = 0, pcls = cdev->states; band < nbands; band++, pcls++ )
{ cmd_prefix *cp = pcls->head;
for ( ; cp != 0; cp = cp->next )
clist_write(file, (byte *)(cp + 1), cp->size);
pcls->size = 1;
pcls->head = pcls->tail = 0;
fputc(cmd_op_end_run, file);
}
cdev->cnext = cdev->cbuf;
cdev->ccls = 0;
}
/* Add a command to the appropriate band list, */
/* and allocate space for its data. */
/* Return the pointer to the data area. */
private byte *
cmd_put_op(gx_device *dev, gx_clist_state *pcls, uint size)
{ byte *dp = cdev->cnext;
#ifdef DEBUG
if ( gs_debug['L'] )
dprintf3("[L]band %d: size=%d, left=%d",
pcls->band, size, (int)(cdev->cend - dp));
#endif
if ( size + (sizeof(cmd_prefix) + 4) > cdev->cend - dp )
{ cmd_write_buffer(dev);
return cmd_put_op(dev, pcls, size);
}
if ( cdev->ccls == pcls )
{ /* We're adding another command for the same band. */
/* Tack it onto the end of the previous one. */
pcls->tail->size += size;
}
else
{ cmd_prefix *cp = (cmd_prefix *)(dp + (((byte *)0 - dp) & 3));
dp = (byte *)(cp + 1);
if ( pcls->tail != 0 ) pcls->tail->next = cp;
else pcls->head = cp;
pcls->tail = cp;
cdev->ccls = pcls;
cp->next = 0;
cp->size = size;
}
cdev->cnext = dp + size;
pcls->size += size;
return dp;
}
/* We store all short quantities little-endian. */
/* This is OK, because we read them back little-endian explicitly. */
#define cmd_putw(w, dp) (*dp = (w) & 0xff, dp[1] = (w) >> 8, dp += 2)
private int
cmd_write_rect_cmd(gx_device *dev, gx_clist_state *pcls,
int op, int x, int y, int width, int height)
{ int dx = x - pcls->rect.x;
int dy = y - pcls->rect.y;
int dwidth = width - pcls->rect.width;
int dheight = height - pcls->rect.height;
#define check_ranges_1()\
((unsigned)(dx - rmin) <= (rmax - rmin) &&\
(unsigned)(dy - rmin) <= (rmax - rmin) &&\
(unsigned)(dwidth - rmin) <= (rmax - rmin))
#define check_ranges()\
(check_ranges_1() &&\
(unsigned)(dheight - rmin) <= (rmax - rmin))
#define rmin cmd_min_tiny
#define rmax cmd_max_tiny
cmd_set_rect(pcls->rect);
if ( dheight == 0 && check_ranges_1() )
{ byte *dp = cmd_put_op(dev, pcls, 2);
count_op(*dp = op + 0x20 + dwidth - rmin);
dp[1] = (dx << 4) + dy - (rmin * 0x11);
}
#undef rmin
#undef rmax
#define rmin cmd_min_short
#define rmax cmd_max_short
else if ( check_ranges() )
{ int dh = dheight - cmd_min_tiny;
byte *dp;
if ( (unsigned)dh <= cmd_max_tiny - cmd_min_tiny && dh != 0 )
{ op += dh;
dp = cmd_put_op(dev, pcls, 4);
}
else
{ dp = cmd_put_op(dev, pcls, 5);
dp[4] = dheight - rmin;
}
count_op(*dp = op + 0x10);
dp[1] = dx - rmin;
dp[2] = dy - rmin;
dp[3] = dwidth - rmin;
}
else
{ byte *dp = cmd_put_op(dev, pcls, 1 + sizeof(pcls->rect));
count_op(*dp = op);
memcpy(dp + 1, &pcls->rect, sizeof(pcls->rect));
}
return 0;
}
private void
cmd_put_color(gx_device *dev, gx_clist_state *pcls,
int op, gx_color_index color)
{ if ( (long)color >= -1 && (long)color <= 13 )
count_op(*cmd_put_op(dev, pcls, 1) = op + (int)color + 2);
else
{ byte *dp = cmd_put_op(dev, pcls, 1 + sizeof(color));
count_op(*dp = op);
memcpy(dp + 1, &color, sizeof(color));
}
}
private void
cmd_set_colors(gx_device *dev, gx_clist_state *pcls,
gx_color_index color0, gx_color_index color1)
{ if ( color0 != pcls->color0 )
{ cmd_put_color(dev, pcls, cmd_op_set_color0, color0);
pcls->color0 = color0;
}
if ( color1 != pcls->color1 )
{ cmd_put_color(dev, pcls, cmd_op_set_color1, color1);
pcls->color1 = color1;
}
}
/* Driver interface */
/* Macros for dividing up a single call into bands */
#define BEGIN_RECT\
{ int yend = y + height;\
int band_height = cdev->band_height;\
do\
{ int band = y / band_height;\
gx_clist_state *pcls = cdev->states + band;\
height = band_height - y % band_height;\
if ( yend - y < height ) height = yend - y;\
{
#define END_RECT\
}\
y += height;\
}\
while ( y < yend );\
}
private int
clist_fill_rectangle(gx_device *dev, int x, int y, int width, int height,
gx_color_index color)
{ BEGIN_RECT
if ( color != pcls->color1 )
cmd_set_colors(dev, pcls, pcls->color0, color);
cmd_write_rect_cmd(dev, pcls, cmd_op_fill_rect, x, y, width, height);
END_RECT
return 0;
}
private int
tile_eq(gx_bitmap *tile, gx_clist_state *pcls)
{ return
(tile->data == pcls->tile.data &&
tile->raster == pcls->tile.raster &&
tile->width == pcls->tile.width &&
tile->height == pcls->tile.height);
}
private int
clist_tile_rectangle(gx_device *dev, gx_bitmap *tile, int x, int y,
int width, int height, gx_color_index color0, gx_color_index color1,
int px, int py)
{ uint tile_size = tile->raster * tile->height;
BEGIN_RECT
if ( color0 != pcls->color0 || color1 != pcls->color1 )
cmd_set_colors(dev, pcls, color0, color1);
if ( px != pcls->phase.x || py != pcls->phase.y )
{ byte *dp = cmd_put_op(dev, pcls, 1 + sizeof(pcls->phase));
count_op(*dp = (byte)cmd_op_set_phase);
pcls->phase.x = px;
pcls->phase.y = py;
memcpy(dp + 1, &pcls->phase, sizeof(pcls->phase));
}
if ( !tile_eq(tile, pcls) ||
memcmp(tile->data, cdev->tile_data, tile_size)
)
{ byte *dp = cmd_put_op(dev, pcls, 1 + 6 + tile_size);
count_op(*dp++ = (byte)cmd_op_set_tile);
cmd_putw(tile->raster, dp);
cmd_putw(tile->width, dp);
cmd_putw(tile->height, dp);
if ( tile_size <= cdev->tile_size )
{ /* Clear the tile records of all the other bands. */
{ gx_clist_state *tcls = cdev->states;
int i;
for ( i = 0; i < cdev->nbands; i++, tcls++ )
tcls->tile.data = 0;
}
pcls->tile = *tile;
memcpy(cdev->tile_data, tile->data, tile_size);
}
memcpy(dp, tile->data, tile_size);
#ifdef DEBUG
cmd_tile_count += tile_size;
#endif
}
cmd_write_rect_cmd(dev, pcls, cmd_op_tile_rect, x, y, width, height);
END_RECT
return 0;
}
private int
clist_copy_mono(gx_device *dev, byte *data, int data_x, int raster,
int x, int y, int width, int height,
gx_color_index color0, gx_color_index color1)
{ int y0 = y;
BEGIN_RECT
gx_cmd_rect rect;
uint dsize = height * raster;
byte *dp;
if ( color0 != pcls->color0 || color1 != pcls->color1 )
cmd_set_colors(dev, pcls, color0, color1);
cmd_set_rect(rect);
dp = cmd_put_op(dev, pcls, 1 + sizeof(rect) + 4 + dsize);
count_op(*dp++ = (byte)cmd_op_copy_mono);
memcpy(dp, (byte *)&rect, sizeof(rect));
pcls->rect = rect;
dp += sizeof(rect);
cmd_putw(data_x, dp);
cmd_putw(raster, dp);
memcpy(dp, data + (y - y0) * raster, dsize);
#ifdef DEBUG
cmd_copy_count += dsize;
#endif
END_RECT
return 0;
}
private int
clist_copy_color(gx_device *dev, byte *data, int data_x, int raster,
int x, int y, int width, int height)
{ int y0 = y;
BEGIN_RECT
gx_cmd_rect rect;
uint dsize = height * raster;
byte *dp;
cmd_set_rect(rect);
dp = cmd_put_op(dev, pcls, 1 + sizeof(rect) + 4 + dsize);
count_op(*dp++ = (byte)cmd_op_copy_color);
memcpy(dp, (byte *)&rect, sizeof(rect));
pcls->rect = rect;
dp += sizeof(rect);
cmd_putw(data_x, dp);
cmd_putw(raster, dp);
memcpy(dp, data + (y - y0) * raster, dsize);
END_RECT
return 0;
}
/* ------ Reading/rendering ------ */
#undef cdev
private int clist_render(P3(gx_device_clist *, gx_device *, int));
/* Initialize for reading. */
int
clist_render_init(gx_device_clist *cdev)
{ gx_device *target = cdev->target;
byte *base = cdev->mdev.base; /* save */
int bpp = target->bits_per_color_pixel;
uint raster = ((target->width * bpp + 31) >> 5) << 2;
gx_device_memory *mdev;
cmd_write_buffer((gx_device *)cdev); /* flush buffer */
switch ( bpp )
{
case 1: mdev = &mem_mono_device; break;
case 8: mdev = &mem_mapped8_color_device; break;
case 24: mdev = &mem_true24_color_device; break;
case 32: mdev = &mem_true32_color_device; break;
default: return_error(gs_error_rangecheck);
}
cdev->mdev = *mdev;
cdev->mdev.base = base; /* restore */
(*target->procs->get_initial_matrix)(target, &cdev->mdev.initial_matrix);
cdev->mdev.width = target->width;
cdev->mdev.height = cdev->band_height;
cdev->mdev.raster = raster;
cdev->ymin = cdev->ymax = 0;
#ifdef DEBUG
if ( gs_debug['l'] | gs_debug['L'] )
{ int ci, cj;
dprintf2("[l]counts: tile = %ld, copy = %ld\n",
cmd_tile_count, cmd_copy_count);
for ( ci = 0; ci < 0x100; ci += 0x10 )
{ dprintf1("[l] %s =", cmd_op_names[ci >> 4]);
for ( cj = ci; cj < ci + 0x10; cj++ )
dprintf1(" %ld", cmd_op_counts[cj]);
dputs("\n");
}
}
#endif
return 0;
}
/* Copy scan lines to the client. This is where rendering gets done. */
int
clist_copy_scan_lines(gx_device_clist *cdev, int start_y,
byte *str, uint size)
{ gx_device_memory *mdev = &cdev->mdev;
uint bytes_per_line = gdev_mem_bytes_per_scan_line((gx_device *)mdev);
uint count = min(size / bytes_per_line,
cdev->target->height - start_y);
int y = start_y;
uint left = count;
byte *dest = str;
/* Render bands and copy them incrementally. */
while ( left )
{ int n;
if ( !(y >= cdev->ymin && y < cdev->ymax) )
{ int band = y / mdev->height;
rewind(cdev->file);
(*mdev->procs->open_device)((gx_device *)mdev); /* reinitialize */
clist_render(cdev, (gx_device *)mdev, band);
gdev_mem_ensure_byte_order(mdev);
cdev->ymin = band * mdev->height;
cdev->ymax = cdev->ymin + mdev->height;
}
n = min(cdev->ymax - y, left);
gdev_mem_copy_scan_lines(mdev, y - cdev->ymin, dest,
bytes_per_line * n);
y += n, dest += bytes_per_line * n, left -= n;
}
return count;
}
/* Render one band to a specified target device. */
#define assign_getw(var, p)\
(var = *p + ((uint)p[1] << 8), p += 2)
#define cbuf_size 500
private void clist_read(P3(FILE *, byte *, uint));
private void clist_skip(P2(FILE *, uint));
private int
clist_render(gx_device_clist *cdev, gx_device *tdev, int band)
{ byte cbuf[cbuf_size];
register byte _ss *cbp;
byte _ss *cb_limit;
byte _ss *cb_end;
FILE *file = cdev->file;
int y0 = band * cdev->band_height;
gx_clist_state state;
gs_int_point tile_phase;
long end_run;
uint left;
#define cmd_read_var(ptr, cbp)\
memcpy(ptr, cbp, sizeof(*ptr)),\
cbp += sizeof(*ptr)
#define cmd_read(ptr, vsize, cbp)\
if ( cb_end - cbp >= vsize )\
memcpy(ptr, cbp, vsize), cbp += vsize;\
else\
{ uint cleft = cb_end - cbp;\
memcpy(ptr, cbp, cleft); vsize -= cleft;\
clist_read(file, ptr + cleft, vsize);\
cbp = cb_end;\
}
state = cls_initial;
tile_phase.x = tile_phase.y = 0;
state.tile.data = cdev->tile_data;
state.tile.width = state.tile.height = 1; /* so set_phase works */
#ifdef DEBUG
if ( gs_debug['l'] | gs_debug['L'] )
dprintf1("[l]render band %d\n", band);
#endif
/* Read the header of a block of buffered commands, */
/* and skip to the correct run for this band. */
top: { uint block_size, start[2];
clist_read(file, (byte *)&block_size, sizeof(block_size));
#ifdef DEBUG
if ( gs_debug['l'] | gs_debug['L'] )
dprintf2("[l]block at %ld, size=%d\n",
ftell(file), block_size);
#endif
if ( feof(file) ) return 0; /* all done */
end_run = ftell(file) + (cdev->nbands + 1) * sizeof(uint) +
(ulong)block_size;
clist_skip(file, band * sizeof(uint));
clist_read(file, (byte *)start, sizeof(start));
left = start[1] - start[0];
clist_skip(file, (cdev->nbands - band - 1) * sizeof(uint) + start[0]);
#ifdef DEBUG
if ( gs_debug['l'] | gs_debug['L'] )
dprintf4("[l]start=%d,%d run=%ld, end_run=%ld\n",
start[0], start[1], ftell(file), end_run);
#endif
}
cb_limit = cbuf + (cbuf_size - cmd_largest_size);
cb_end = cbuf + cbuf_size;
cbp = cb_end;
for ( ; ; )
{ int op;
uint bytes;
int code;
gx_color_index _ss *pcolor;
/* Make sure the buffer contains a full command. */
if ( cbp > cb_limit )
{ uint nread;
memcpy(cbuf, cbp, cb_end - cbp);
cbp = cbuf + (cb_end - cbp);
nread = cb_end - cbp;
if ( nread > left ) nread = left;
clist_read(file, cbp, nread);
cb_end = cbp + nread;
cbp = cbuf;
left -= nread;
if ( cb_limit > cb_end ) cb_limit = cb_end;
}
op = *cbp++;
#ifdef DEBUG
if ( gs_debug['L'] )
dprintf2("[L]%s %d:\n", cmd_op_names[op >> 4], op & 0xf);
#endif
switch ( op >> 4 )
{
case cmd_op_set_color0 >> 4:
pcolor = &state.color0;
goto set_color;
case cmd_op_set_color1 >> 4:
pcolor = &state.color1;
set_color: if ( op & 0xf )
*pcolor = (gx_color_index)(long)((op & 0xf) - 2);
else
cmd_read_var(pcolor, cbp);
continue;
case cmd_op_set_tile >> 4:
assign_getw(state.tile.raster, cbp);
assign_getw(state.tile.width, cbp);
assign_getw(state.tile.height, cbp);
bytes = state.tile.height * state.tile.raster;
cmd_read(state.tile.data, bytes, cbp);
#ifdef DEBUG
if ( gs_debug['L'] )
cmd_print_bits(state.tile.data, state.tile.height,
state.tile.raster);
#endif
goto set_phase;
case cmd_op_set_phase >> 4:
cmd_read_var(&state.phase, cbp);
set_phase: tile_phase.x = state.phase.x % state.tile.width;
tile_phase.y = (state.phase.y + y0) % state.tile.height;
continue;
case cmd_op_fill_rect >> 4:
case cmd_op_tile_rect >> 4:
case cmd_op_copy_mono >> 4:
case cmd_op_copy_color >> 4:
cmd_read_var(&state.rect, cbp);
break;
case cmd_op_fill_rect_short >> 4:
case cmd_op_tile_rect_short >> 4:
state.rect.x += *cbp + cmd_min_short;
state.rect.y += cbp[1] + cmd_min_short;
state.rect.width += cbp[2] + cmd_min_short;
state.rect.height +=
(op & 0xf ? (op & 0xf) + cmd_min_tiny :
(++cbp)[2] + cmd_min_short);
cbp += 3;
break;
case cmd_op_fill_rect_tiny >> 4:
case cmd_op_tile_rect_tiny >> 4:
{ int txy = *cbp++;
state.rect.x += (txy >> 4) + cmd_min_tiny;
state.rect.y += (txy & 0xf) + cmd_min_tiny;
state.rect.width += (op & 0xf) + cmd_min_tiny;
} break;
case cmd_op_end_run >> 4:
fseek(file, end_run, SEEK_SET); /* skip rest of block */
goto top;
default:
lprintf5("Bad op %02x band %d file pos %ld buf pos %d/%d\n",
op, band, ftell(file), (int)(cbp - cbuf), (int)(cb_end - cbuf));
return -1;
}
#ifdef DEBUG
if ( gs_debug['L'] )
dprintf4("[L] x=%d y=%d w=%d h=%d\n",
state.rect.x, state.rect.y, state.rect.width,
state.rect.height);
#endif
switch ( op >> 4 )
{
case cmd_op_fill_rect >> 4:
case cmd_op_fill_rect_short >> 4:
case cmd_op_fill_rect_tiny >> 4:
code = (*tdev->procs->fill_rectangle)
(tdev, state.rect.x, state.rect.y - y0,
state.rect.width, state.rect.height, state.color1);
break;
case cmd_op_tile_rect >> 4:
case cmd_op_tile_rect_short >> 4:
case cmd_op_tile_rect_tiny >> 4:
code = (*tdev->procs->tile_rectangle)
(tdev, &state.tile,
state.rect.x, state.rect.y - y0,
state.rect.width, state.rect.height,
state.color0, state.color1,
tile_phase.x, tile_phase.y);
break;
case cmd_op_copy_mono >> 4:
case cmd_op_copy_color >> 4:
{ int data_x, raster;
assign_getw(data_x, cbp);
assign_getw(raster, cbp);
#ifdef DEBUG
if ( gs_debug['L'] )
dprintf2("[L] data_x=%d raster=%d\n",
data_x, raster);
#endif
bytes = state.rect.height * raster;
/* The following doesn't work for very large */
/* bitmaps, but it's good enough for now. */
cmd_read(cbuf, bytes, cbp);
#ifdef DEBUG
if ( gs_debug['L'] )
cmd_print_bits(cbuf, state.rect.height, raster);
#endif
code = (op >> 4 == (byte)cmd_op_copy_mono >> 4 ?
(*tdev->procs->copy_mono)
(tdev, cbuf, data_x, raster,
state.rect.x, state.rect.y - y0,
state.rect.width, state.rect.height,
state.color0, state.color1) :
(*tdev->procs->copy_color)
(tdev, cbuf, data_x, raster,
state.rect.x, state.rect.y - y0,
state.rect.width, state.rect.height));
} break;
}
if ( code < 0 ) return code;
}
}
/* The typical implementations of fread and fseek */
/* are extremely inefficient for small counts, */
/* so we use loops instead. */
private void
clist_read(FILE *f, byte *str, uint len)
{ switch ( len )
{
default: fread(str, 1, len, f); break;
case 8: *str++ = (char)getc(f);
case 7: *str++ = (char)getc(f);
case 6: *str++ = (char)getc(f);
case 5: *str++ = (char)getc(f);
case 4: *str++ = (char)getc(f);
case 3: *str++ = (char)getc(f);
case 2: *str++ = (char)getc(f);
case 1: *str = (char)getc(f);
}
}
private void
clist_skip(FILE *f, uint len)
{ if ( len <= 10 )
{ register int i;
for ( i = 0; i < len; i++ ) getc(f);
}
else
fseek(f, (long)len, SEEK_CUR);
}